C# Signature:

    [DllImport("iphlpapi.dll", EntryPoint = "PfRemoveFiltersFromInterface")]
    static extern uint PfRemoveFiltersFromInterface(IntPtr ih, uint cInFilters,
    [MarshalAsAttribute(UnmanagedType.Struct)] ref PPF_FILTER_DESCRIPTOR pfiltIn, uint cOutFilters,
    [MarshalAsAttribute(UnmanagedType.Struct)] ref PPF_FILTER_DESCRIPTOR pfiltOut);

VB Signature:

Declare Function PfRemoveFiltersFromInterface Lib "iphlpapi.dll" (TODO) As TODO

User-Defined Types:

    internal enum PFADDRESSTYPE : uint
    {
        PF_IPV4,
        PF_IPV6
    }

    public enum FILTER_FLAGS : uint
    {
        FD_FLAGS = 0x1
    }

    public enum PROTOCOL : uint
    {
        ANY = 0x00,
        ICMP = 0x01,
        TCP = 0x06,
        UDP = 0x11
    }

    [StructLayout(LayoutKind.Sequential, Pack = 1)]
    internal unsafe struct PPF_FILTER_DESCRIPTOR
    {
        public FILTER_FLAGS dwFilterFlags;
        public UInt32 dwRule;
        public PFADDRESSTYPE pfatType;

        public UInt32* SrcAddr;
        public UInt32* SrcMask;
        public UInt32* DstAddr;
        public UInt32* DstMask;

        public PROTOCOL dwProtocol;
        public UInt32 fLateBound;
        public UInt16 wSrcPort;
        public UInt16 wDstPort;
        public UInt16 wSrcPortHighRange;
        public UInt16 wDstPortHighRange;
    }

Alternative Managed API:

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Notes:

    /// <summary>
    /// The PfRemoveFiltersFromInterface function removes the specified filters from the interface.
    /// </summary>
    /// <param name="ih">[in] Handle to the interface.</param>
    /// <param name="cInFilters">[in] Specifies the number of input filter descriptions pointed to by the pfiltIn parameter.</param>
    /// <param name="pfiltIn">[in] Pointer to an array of filter descriptions to use as input filters.</param>
    /// <param name="cOutFilters">[in] Specifies the number of output filters descriptions pointed to by the pfiltOut parameter.</param>
    /// <param name="pfiltOut">[in] Pointer to an array of filter descriptions to use as output filters.</param>
    /// <returns>If the function succeeds, the return value is NO_ERROR.</returns>

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Sample Code:

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